postgresql: fix passthru when using withPackages

[m1-s]

Currently, when using postgresqlWithPackages the passthru attributes are lost. This is causing errors in the postgresql nixos module as it needs the withJit passthru attributes.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[wolfgangwalther]

This will not work as expected, yet, because:

nix-repl> (pkgs.postgresql.withPackages (ps: []))
«derivation /nix/store/k5hyfpgsvra5ahi59nb82rk1y1mfqgas-postgresql-and-plugins-17.0.drv»

nix-repl> (pkgs.postgresql.withPackages (ps: [])).withJIT
«derivation /nix/store/qa9lkfa313gsnkhlks08cxqndx8ddrz2-postgresql-jit-17.0.drv»

i.e. once you use withJIT on your "postgresql-and-plugins", you'll end up with a bare postgresql_jit, without plugins.

[wolfgangwalther]

I tried a slightly different approach in #352158, have a look!